Regio- and stereoselective cyclopropanation of functionalised dienes. Novel methodology for the synthesis of vinyl- and divinyl-cyclopropanes
摘要:
Dienes, bearing an electron-withdrawing substituent at C-1, are cyclopropanated regio- and stereo selectively at the C-C double bond proximal to this electron-withdrawing group. The highest selectivity is observed in the case of dienylboronates. The cyclopropanation of these substrates affords almost exclusively the synthetically useful 1-boronato-2-vinyl-cyclopropanes. (C) 2002 Elsevier Science Ltd. All rights reserved.
(−)-trans-Kumausyne was synthesized from D-(+)-xylose. Radicalcyclization reaction of a β-alkoxyacrylate intermediate proceeded stereoselectively to give a tetrahydrofuranyl product with correct stereochemistry.
Enantioselective construction of the tetrahydropyran and tetrahydrofuran fragments of the antitumor agent mucocin from a common intermediate
作者:P. Andrew Evans、V.Srinivasa Murthy
DOI:10.1016/s0040-4039(98)02674-4
日期:1999.2
The cis-2,6-disubstituted tetrahydropyran 3 and trans-2,5-disubstituted tetrahydrofuran 4 required for the total synthesis of the potent antitumor agent mucocin 1 were prepared from the α,β-unsaturated ester 2 using a complementary Sharpless asymmetric epoxidation/cyclization protocol.
Khrimyan, Ashot P.; Gharibyan, Oganes A.; Streinz, Ludvik, Collection of Czechoslovak Chemical Communications, 1989, vol. 54, # 12, p. 3284 - 3293
作者:Khrimyan, Ashot P.、Gharibyan, Oganes A.、Streinz, Ludvik、Wimmer, Zdenek、Romanuk, Miroslav、Badanyan, Shaliko O.
DOI:——
日期:——
Expeditious Total Syntheses of Natural Allenic Products via Aromatic Ring Umpolung
作者:Cyrille Sabot、Didier Bérard、Sylvain Canesi
DOI:10.1021/ol801921d
日期:2008.10.16
Concise diastereoselective syntheses of the marine (+/-)-panacene and terrestrial (+/-)-desbromopanacene have been achieved in a few steps based on a concept of "aromatic ring umpolung". The synthetic avenue to the (+/-)-panacene involved a novel oxymercuration strategy to produce the correct configuration of the bromoallene moiety.
Strenz, Ludvik; Saman, David; Konecny, Karel, Collection of Czechoslovak Chemical Communications, 1990, vol. 55, # 6, p. 1555 - 1561
作者:Strenz, Ludvik、Saman, David、Konecny, Karel、Romanuk, Miroslav