Gulzar Ahmed

Type II intramolecular annulations between vinylcarbenoids and furans

Abstract Rhodium(II) octanoate catalyzed intramolecular reactions between vinyldiazomethanes and furans result in the formation of polycyclic systems by a tandem cyclopropanation/Cope rearrangement.

Heterocumulenes as 2π partners in metal-promoted [6π+2π] cycloaddition reactions

Abstract Alkyl and aryl substituted isocyanates and ketenes have been shown to be useful 2π partners in photoinitiated chromium(O)-promoted [6π+2π] cycloaddition reactions.

[1+4] Cycloaddition of vinyl isocyanates with isocyanides. Construction of functionally elaborate pyrrolinone derivatives

Abstract Reaction of alkyl isocyanides with vinyl isocyanates affords highly functionalized pyrrolinone and hydroindolone products via a novel [1+4] cyclization process.

Absolute configuration of C20H30O6Si, a species with a (1R,5R)-8-oxabicyclo[3.2.1]octa-2,6-diene core produced selectivity by the rhodium(II) octanoate catalyzed decomposition of a chiral vinyldiazomethane in the presence of furan

The compound under investigation crystallizes in the noncentrosymmetric monoclinic space group P21 with a = 9.1798(23), b = 6.6606(18), c = 17.6591(41) Å, β = 94.342(20)° and Z = 2. The C20H30O6Si molecule contains three chiral centers (one of which is of known configuration, based upon an (R)-pantolactone auxiliary group). We have determined the absolute configuration of this species (via the anomalous dispersion of Si relative to C and O) and show that it is consistent with the known configuration of the (R)-pantolactone moiety