A highly stereoselective preparation of <i>syn</i>-1,2-diols from secondary α-allenic alcohols via iodocyclization. Synthesis of (±)-<i>threo</i>-L-factor and (±)-disparlure
作者:Richard W. Friesen、André Giroux
DOI:10.1139/v94-236
日期:1994.8.1
The iodocyclization of the N-tosyl carbamates 5 of secondary α-allenic alcohols 4 is described. The reaction sequence involves the addition of iodine to the terminal olefin of the allene moiety of 5 resulting in the formation of an isomeric mixture of Z and E diiodides 6 and 7. This initial process is followed, in the same pot, by reaction of the diiodides with silver carbonate. Hydrolysis of the resulting
A highly stereoselective preparation of a novel class of vinyl epoxides from .alpha.-allenic alcohols
作者:Richard W. Friesen、Marc Blouin
DOI:10.1021/jo00059a006
日期:1993.3
Treatment of alpha-allenic alcohols 1 with iodine provides a mixture of Z- and E-diiodides 2 and 3, respectively. When treated with base, the diiodides are efficiently converted in a highly diastereoselective manner into the trans-iodovinyl epoxides 4.
IMAMOTO, TSUNEO;KUSUMOTO, TETSUO;TAWARAYAMA, YOSHINORI;SUGIURA, YASUSHI;M+, J. ORG. CHEM., 1984, 49, N 21, 3904-3912