Raju Rajesh

Methyl 11-hy­droxy-9-[1-(4-meth­oxy­phen­yl)-4-oxo-3-phen­oxy­azetidin-2-yl]-18-oxo-10-oxa-2-aza­penta­cyclo­[9.7.0.01,8.02,6.012,17]octa­deca-12(17),13,15-triene-8-carboxyl­ate

In the title compound, C34H32N2O8, one of the pyrrolidine rings in the pyrrolizidine ring system adopts a twist conformation, whereas the other ring adopts an envelope conformation (C atom as flap). The five-membered ring in the indene ring system and the fused furan ring also adopt envelope conformations (C and O atoms as flaps, respectively). The β-lactam ring makes dihedral angles of 23.41 (2) and 25.98 (2)°, respectively, with the attached methoxyphenyl and phenoxy rings. The molecular conformation is stabilized by an intramolecular O—H⋯N hydrogen bond, generating an S(5) motif. In the crystal, molecules are linked into C(12) chains running along the a axis by C—H⋯O hydrogen bonds. The structure is further consolidated by weak intermolecular C—H⋯π and π–π interactions [centroid–centroid distance = 3.7987 (14) Å].

A bright entry to improve the performance of DSSCs with the influence of novel optoelectronic acridinedione based macromolecules in I−/I3− electrolytes

The performance of Ru(II) dye-sensitized nanocrystalline TiO2 solar cells (DSSCs) is described with newly synthesized multivalent macromolecules, containing excellent optoelectronic acridinedione linked with 1,2,3-triazole units, via a novel and convenient Cu(I)-catalyzed alkyne and azide 1,3-dipolar cycloaddition (CuAAC) reaction. These unique macromolecules have proved to be highly suitable for utilizing additives in I−/I3− redox couple electrolytes. Among the various substitutions, the maximum photo-current conversion efficiency of about 6.4% with a Voc of 810 mV was obtained with electron rich substitutions in the nitrogen heteroatom.

2-[(4-Formyl­phen­yl)(hy­droxy)meth­yl]acrylonitrile

In the title compound, C11H9NO2, the mean planes formed by the phenyl and acryl group are almost orthogonal to each other, with a dihedral angle of 88.61 (7)°. The carbonitrile side chain is almost linear, the C—C—N angle being 179.54 (16)°. In the crystal, molecules are linked by intermolecular O—H⋯O interactions into infinite chains running parallel to the b axis.

Synthesis and Antimicrobial Evaluation of Novel Bis-β-lactam Grafted Macrocycles

A series of macrocyclic bis-β-lactams has been synthesized in three good yielding steps using a Staudinger [2+2] cycloaddition reaction of ketene derived from phenoxyacetyl chloride as the key step. The reaction provided a diastereomeric mixture of cis-anti-cis (C2-symmetry) and cis-syn-cis (meso) bis-β-lactam grafted macrocycles which were screened for their in vitro antibacterial and antifungal activities against four human pathogenic bacteria and two pathogenic fungi. Compounds 6a and 6b exhibited antibacterial activity at lower concentration against four bacterial pathogens and compounds 10b and 12a showed antifungal activity against two fungal pathogens when compared to reference control.

11-[1-(4-Meth­oxy­phen­yl)-4-oxo-3-phen­oxy­azetidin-2-yl]-14-methyl-12-oxa-8,14-diaza­tetra­cyclo­[8.3.3.01,10.02,7]hexa­deca-2(7),3,5-triene-9,13-dione

In the title compound, C30H27N3O6, the furan and pyrrolidine rings adopt envelope conformations (with C and N atoms as the flaps, respectively). The piperidine ring is in a distorted boat conformation. The β-lactam ring is planar [maximum deviation = 0.0044 (16) Å] and forms dihedral angles of 30.61 (9) and 85.51 (9)°, respectively, with the attached methoxyphenyl and phenoxy rings. The crystal packing is stabilized by N—H⋯O and C—H⋯O interactions forming R 2 2(8), R 2 2(20) and R 2 2(14) ring motifs. The crystal structure is further consolidated by weak C—H⋯π interactions.

2-{Hy­droxy[1-(4-meth­oxy­phen­yl)-4-oxo-3-phenyl­azetidin-2-yl]meth­yl}acrylonitrile

In the title compound, C20H18N2O3, the β-lactam ring is essentially planar, having a maximum deviation of 0.0291 (15) Å for the N atom, and perpendicular to the phenyl ring [dihedral angle = 85.55 (11)°]. The carbonitrile side chain is almost linear, the C—C—N angle being 176.8 (2)°. The crystal packing is stabilized by intermolecular O—H⋯O and C—H⋯O interactions.

(1S,3′S,3a′R,6′S)-6′-(2-Chloro­phen­yl)-3′-[(2R,3S)-1-(4-meth­oxy­phen­yl)-4-oxo-3-phenyl­azetidin-2-yl]-2-oxo-3′,3′a,4′,6′-tetra­hydro-2H,2′H-spiro­[ace­naphthyl­ene-1,1′-pyrrolo­[1,2-c][1,3]thia­zole]-2′,2′-dicarbo­nitrile

The molecular conformation of the title compound, C41H29ClN4O3S, is stabilized by intramolecular C—H⋯O and C—H⋯Cl hydrogen bonds. The thiazole ring adopts an envelope conformation with the N atom as the flap, while the pyrrolidine ring has a twisted conformation on the N—C bond involving the spiro C atom. The β lactam ring makes dihedral angles of 39.74 (15) and 16.21 (16)° with the mean planes of the thiazole and pyrrolidine rings, respectively. The thiazole ring mean plane makes dihedral angles of 23.79 (13) and 70.88 (13) ° with the pyrrolidine and cyclopentane rings, respectively, while the pyrrolidine ring makes a dihedral angle of 85.63 (13)° with the cyclopentane ring. The O atom attached to the β lactam ring deviates from its mean plane by 0.040 (2) Å, while the O atom attached to the cyclopentane ring deviates from its mean plane by 0.132 (2) Å. In the crystal, molecules are linked by C—H⋯O hydrogen bonds, forming chains along [010], and C—H⋯π and π-π interactions [centroid-centroid distance = 3.6928 (17) Å].

Methyl 12-hydroxy-10-[1-(4-meth­oxy­phen­yl)-2-oxo-3-phen­oxy­azetidin-4-yl]-11-oxa-3-aza­hexa­cyclo­[11.7.1.02,9.02,12.03,7.017,21]henicosa-1(20),13,15,17(21),18-penta­ene-9-carboxyl­ate

In the title compound, C37H34N2O7, both pyrrolidine rings adopt envelope conformations. The β-lactam ring is close to planar (r.m.s. deviation = 0.0395 Å) and makes a dihedral angle of 83.35 (15)° with the furan ring. The O atom attached to the β-lactam ring deviates by 0.187 (2) Å from the mean plane of the ring. The β-lactam ring makes dihedral angles of 14.90 (15) and 27.72 (17)° with the methoxyphenyl and phenyl rings, respectively. The crystal packing features C—H⋯O hydrogen bonds.

Methyl 11-hy­droxy-9-[1-(4-meth­oxy­phen­yl)-4-oxo-3-phenyl­azetidin-2-yl]-18-oxo-10-oxa-2-aza­penta­cyclo­[9.7.0.01,8.02,6.012,17]octa­deca-12(17),13,15-triene-8-carboxyl­ate

In the title compound, C34H32N2O7, the furan ring adopts a twist conformation and both the pyrrolidine rings adopt envelope conformations with O and C as flap atoms. The β-lactam ring makes a dihedral angles of 80.20 (10)° with the furan ring, of 75.55 (10)° with the pyrrolidine ring, of 12.26 (10)° with the methoxyphenyl ring and of 73.77 (13)° with the phenyl ring. The O atom attached to the β-lactam ring deviates by 0.0385 (13) Å from the ring plane. The molecular conformation is stabilized by intramolecular O—H⋯N and C—H⋯O hydrogen bonds. The packing of the crystal is stabilized by intermolecular C—H⋯O hydrogen bonds, which form a chain running along the b axis.

11-Hy­droxy-9-[1-(4-methyl­phen­yl)-4-oxo-3-phenyl­azetidin-2-yl]-18-oxo-10-oxa-2-aza­penta­cyclo­[9.7.0.01,8.02,6.012,17]octa­deca-12,14,16-triene-8-carbonitrile

In the title compound, C33H29N3O5, the four-membered ring of the β-lactam fragment is essentially planar (r.m.s. deviation = 0.0122 Å), with the carbonyl O atom displaced from this ring by 0.856 (9) Å. The mean planes of the methoxyphenyl and phenyl rings are inclined at dihedral angles 85.10 (7) and 21.56 (14)°, respectively, with respect to the mean plane of the four-membered ring. The pyrrolidine rings adopt envelope conformations with C atoms lying 0.535 (4) and 0.519 (4) Å out of the planes formed by the remaining ring atoms. The furan ring also adopts an envelope conformation with a C atom 0.560 (3) Å out of the plane formed by the remaining ring atoms. The nine-membered indene ring is almost planar (r.m.s. deviation = 0.0240 Å), with the carbonyl O atom displaced by 0.145 (3) Å from this ring. The molecular structure is stabilized by a strong intramolecular O—H⋯N hydrogen bond and the crystal structure is consolidated by C—H⋯O hydrogen bonds.