Summon Koul

Koelpinin-A, B and C — three triterpenoids from Koelpinia linearis

Three new triterpenoids, designated as koelpinin-A, B and C and characterised as 28-nor-lup-12,17-dien-3 beta,16 alpha-diol,3 beta-acetoxy-28-nor-lup-12,17-dien-16 alpha-ol and 28-nor-lup-12,17-dien-3 beta-ol-16-one, respectively, together with 30-nor-lup-3 beta-ol-20-one, taraxeryl acetate and germanicol, were isolated, from the aerial parts of Koelpinia linearis. 13C-NMR shifts were assigned after performing APT and DEPT experiments.

Isocladrastin and kashmigenin—two isoflavones from Iris kashmiriana

Abstract From the rhizomes of the Iris kashmiriana , two new isoflavones, isocladrastin and kashmigenin, were characterized as 3′-hydroxy-6,7-4′-trimethoxy-isoflavone and 4′-hydroxy-3′,5′-dimethoxy-6,7-methylenedioxy-isoflavone, respectively. Also, junipegenin-B has been found present in this plant species.

Solid‐Phase One Step Synthesis of 4H,4′‐Exomethylene‐bis[quinazolin‐2‐enols]

Abstract The solid‐phase one step synthesis of 4H,4′‐exomethylene‐bis[quinazolin‐2‐enols] via 1,3‐dipolar cycloaddition of urea on benzylideneacetophenone using Sb(III) chloride impregnated alumina is described. The reaction provides 80–85% dimeric quniazolinenols. The process is convenient, cost‐effective and eco‐friendly.

ONE STEP DIMERIZATION OF LINEAR FURANOCOUMARINS

ABSTRACT The one step annular dimerisation of naturally occuring linear furanocoumarins has been effected in 70–85% yield by PPA-SiO2.