The diastereoselective carbonyl-ene reaction of various 1,1-disubstituted olefins with the chiral derivatives of glyoxylic acid, with Oppolzer's sultam 1a and 8-phenylmenthol 1b auxiliaries, was studied. The reaction proceeds effectively under undemanding conditions in the presence of equimolar or catalytic amount of ZnBr2 in good yield and at 72-94% de. Diastereoselectivities are usually slightly better with 8-phenylmenthyl glyoxylate 1b, however, the use of hemiacetal la is preferred because the products are often crystalline. (c) 2007 Elsevier Ltd. All rights reserved.
Preparation of 8-phenylmenthol and its diastereomer, 2-epi,ent-8-phenylmenthol. A caveat
作者:James K. Whitesell、Chi Ling Liu、Charles M. Buchannan、Hwang Hsing Chen、Mark A. Minton
DOI:10.1021/jo00354a032
日期:1986.2
WHITESELL, J. K.;BHATTACHARYA, A.;AGUILAR, D. A.;HENKE, K., J. CHEM. SOC. CHEM. COMMUN., 1982, N 17, 989-990
作者:WHITESELL, J. K.、BHATTACHARYA, A.、AGUILAR, D. A.、HENKE, K.
DOI:——
日期:——
WHITESELL J. K.; BHATTACHARYA A.; BUCHANAN C. M.; CHEN H. H.; DEYO D.; JA+, TETRAHEDRON, 42,(1986) N 11, 2993-3001
作者:WHITESELL J. K.、 BHATTACHARYA A.、 BUCHANAN C. M.、 CHEN H. H.、 DEYO D.、 JA+