Stereoselective synthesis of 3-hydroxy-2-sulfonyltetrahydrofurans from β-(triethylsilyloxy)aldehydes and p -tolylsulfonyldiazomethane
作者:Steven R Angle、Stephanie Z Shaw
DOI:10.1016/s0040-4020(01)00365-9
日期:2001.6
A new method for the stereoselective syntheses of 2-sulfonyltetrahydrofurans fromβ-(triethylsilyloxy)aldehydes and p-tolylsulfonyldiazomethane in the presence of BF3·OEt2 as Lewis acid is reported. The versatility of the sulfonyl functional group allows further functionalization alpha to the sulfonyl group. For example, treatment of 2-sulfonlytetrahydrofuran 2b with BF3·OEt2 and allyl silane afforded
Highly Enantioselective Synthesis of [1,2,4]Triazino[5,4-<i>a</i>]isoquinoline Derivatives via (3 + 3) Cycloaddition Reactions of Diazo Compounds and Isoquinolinium Methylides
An array of chiral [1,2,4]triazino[5,4-a]isoquinoline derivatives were obtained in excellent yields (up to 98%) and with excellent enantioselectivities (up to 99% ee) via a new highly asymmetric (3 + 3) cycloaddition reaction of diazocompounds and isoquinolinium methylides, with a bifunctional chiral phase-transfer catalyst (PTC). Density functional theory calculations show that PTC has a bridge role
Micellar effects on the reaction of (arylsulfonyl)alkyl arenesulfonates with hydroxide ion. 1. Microenvironmental and substituent effects in the Stern layer of cationic micelles
作者:Gerard B. Van de Langkruis、Jan B. F. N. Engberts
DOI:10.1021/jo00196a010
日期:1984.11
FRIDMAN A. L.; ANDREJCHIKOV YU. S.; GEJN V. L.; GEJN L. F., ZH. ORGAN. XIMII <ZORK-AE>, 1976, 12, HO 2, 463
作者:FRIDMAN A. L.、 ANDREJCHIKOV YU. S.、 GEJN V. L.、 GEJN L. F.