Stereoselective synthesis of all-trans methyl substituted polyenes by reductive elimination and application to the synthesis of all-trans 3-methyl-nona-2,4,6-trienol
作者:Guy Solladié、Françoise Colobert、Chakib Kalaı̈
DOI:10.1016/s0040-4039(00)00564-5
日期:2000.5
The stereoselectivesynthesis of all-trans 3-methyl-nona-2,4,6-trienol 2 by reductive elimination of the corresponding 1,6-dibenzoate-2-methyl-2(Z),4(Z)-diene is described. This result shows that reductive elimination can be extended to the formation of all-trans methyl substituted polyenes which are present in many natural products biosynthetically made from isoprenic units.
A Unified Total Synthesis of the Immunomodulators (−)-Rapamycin and (−)-27-Demethoxyrapamycin: Assembly of the Common C(1−20) Perimeter and Final Elaboration
作者:Amos B. Smith、Stephen M. Condon、John A. McCauley、Johnnie L. Leazer、James W. Leahy、Robert E. Maleczka
DOI:10.1021/ja963067o
日期:1997.2.1
The potent, naturally occurring immunomodulators (−)-rapamycin (1) and (−)-27-demethoxyrapamycin (2) have been synthesized via a unified and highly convergent strategy. In the preceding paper we discussed the construction of common building blocks A−C and their linkage to provide the C(21−42) segments of 1 and 2. Herein we describe model studies of triene generation and hydroxyl deprotection, the preparation