A general strategy to spiro[4.n]alk-2-ene-1,6-diones and spiro[5.n]alk-2-ene-1,7-diones via intramolecular acylation of α-sulfinyl carbanions
摘要:
A convenient and general synthetic method for spiro[4.n]alk-2-ene-1,6-diones and spiro[5.n]alk-2-ene- 1,7-diones, which involves the intramolecular acylation of an oc-sulfinyl carbanion, is described. (C) 2000 Elsevier Science Ltd. All rights reserved.
Baeyer-Villiger oxidations catalyzed by engineered microorganisms: Enantioselective synthesis of δ-valerolactones with functionalized chains
作者:Shaozhao Wang、Gang Chen、Margaret M Kayser、Hiroaki Iwaki、Peter C.K Lau、Yoshie Hasegawa
DOI:10.1139/v02-035
日期:2002.6.1
Cyclohexanonemonooxygenase (CHMO) from Acinetobacter sp NCIMB 9871 expressed in baker's yeast and in E. coli and cyclopentanone monooxygenase (CPMO) from Comamonas (previously Pseudomonas) sp. NCIMB 9872 expressed in E. coli are new bioreagents for Baeyer-Villigeroxidations. These engineered microorganisms, requiring neither biochemical expertise nor equipment beyond that found in chemical laboratories
Free radical ring expansion by three and four carbons
作者:Paul Dowd、Soo Chang Choi
DOI:10.1021/ja00255a071
日期:1987.10
Nouvelle methode d'agrandissement de cycles de β-ceto esters a 5, 6, 7 carbones par une reaction radicalaire regioselective pour acceder a des cycles a 8, 9, 10, 11 atomes de carbone
Nouvelle methode d'agrandissement de Cycles de β-cetoesters a 5, 6, 7 carbones par une 反应激进分子区域选择性倾倒剂 a des Cycles a 8, 9, 10, 11 atomes de carbone
Environmentally friendly TPDS-mediated free radical ring expansion of α-haloalkyl cyclic β-keto esters
作者:Masaaki Sugi、Hideo Togo
DOI:10.1016/s0040-4020(02)00241-7
日期:2002.4
Reactivities of tetraphenyldisilane (TPDS), tris(trimethylsilyl)silane, and tributyltin hydride in the radicalringexpansion of α-haloalkyl cyclic β-keto esters were examined. Among these reagents, TPDS was found most effective for the preparation of medium-sized cyclic compounds in terms of yields and ring-expansion/reduction selectivity.
Synthesis of alkylated indolizidine alkaloids via Pummerer mediated cyclization: synthesis of (±)-indolizidine 167B, (±)-5-butylindolizidine and (±)-monomorine I
The syntheses of indolizidine alkaloids, i.e., (+/-)-coniceine, (+/-)-indolizidine 167B, (+/-)-5-butylindolizidine and (+/-)-monomorine I via Pummerer cyclization are described. The key step is the transformation of lactam sulfoxide to bicyclic lactam via the Pummerer cyclization. (C) 2007 Elsevier Ltd. All rights reserved.
DOWD, PAUL;CHOI, SOO-CHANG, TETRAHEDRON, 45,(1989) N, C. 77-90