The hemisynthesis of 1 alpha -hydroxydrimenol has been selected to illustrate a synthetic route involving an initial microbial 3 beta -hydroxylation of a drimenol derivative followed by a functionalization transfer to position 1 alpha, thus generating a new potentially bioactive hydroxylated terpenic compound, Several methods have been investigated for the protection and the regeneration of the 7,8-double bond of drimenyl derivatives. (C) 2001 Elsevier Science Ltd. All rights reserved.
Synthetic Access to Bent Polycycles by Cation-π Cyclization
作者:Ryan A. Shenvi、E. J. Corey
DOI:10.1021/ol101410g
日期:2010.8.6
The presence of an ether oxygen within a chain undergoing cation-polyene cyclization has a profound Influence on the stereochemistry of this important construction, apparently due to nucleophilic participation of oxygen in the cyclization process and formation of an oxonium intermediate, leading to bent fused ring systems.
AYER, WILLIAM A.;CRAW, PETER A., CAN. J. CHEM., 67,(1989) N, C. 1371-1380