A Scalable Route to Trisubstituted (E)-Vinyl Bromides
摘要:
An effective, readily scalable two-step synthesis of trisubstituted (E)-vinyl bromides involving bromination of alpha,beta-unsaturated lactones followed by hydrolytic fragmentation has been developed. Several trisubstituted (E)-vinyl bromides, including multigram quantities of (+)-(E)-4-bromo-2-methyl-3-pentenol, a synthetic intermediate required for the C(8)-C(l 1) moieties of (+)-tedanolide (1) and (+)-13-deoxytedanolide (2), illustrate the utility of this protocol.
Palladium-catalyzed carbonylation. A new synthesis of .alpha.-methylene .gamma.-, .delta.-, .epsilon.-lactams and lactones including bicyclic lactams of pyrrolizidine and indolizidine skeletons
作者:Miwako Mori、Yumiko Washioka、Takao Urayama、Kagari Yoshiura、Katsumi Chiba、Yoshio Ban
DOI:10.1021/jo00170a037
日期:1983.11
Direct synthesis of seven- and eight-membered lactones by ruthenium-catalyzed cyclocarbonylation of allenyl alcohols
Carbonylation of 6-hydroxyhexa-1,2-dienes and 7-hydroxyhepta-1,2-dienes with a ruthenium catalyst in triethylamine quantitatively gave seven- and eight-membered lactones, respectively, in which the hydroxyl group of allenyl alcohols participated in the cyclization. (C) 2001 Elsevier Science Ltd. All rights reserved.
FOUQUE, ELIE;ROUSSEAU, GERARD;SEYDEN-PENNE, JACQUELINE, J. ORG. CHEM., 55,(1990) N6, C. 4807-4817