Introduction of functionalized substituents into active methylene compounds
作者:Isaburo Hori、Takeshi Oishi
DOI:10.1016/s0040-4039(01)86511-4
日期:1979.1
Condensation of active methylene compounds with variously functionalized carbon two unit Michael acceptors (–) afforded the corresponding adducts, respectively. Reaction of such Michael adducts with NBS to afford the vinyl (, , and ) and ethynyl () bromides will also be described.
Shainyan; Danilevich, Russian Journal of Organic Chemistry, 1998, vol. 34, # 12, p. 1721 - 1726
作者:Shainyan、Danilevich
DOI:——
日期:——
One-flask, regiospecific conversions of allylic alcohols into 2-carbon-extended, conjugated dienoate esters. Use of a new sulfinyl orthoester
作者:Gary H. Posner、R. David Crouch、Chris M. Kinter、Jean Christophe Carry
DOI:10.1021/jo00025a008
日期:1991.12
Sixteen differently substituted primary and secondary allylic alcohols are shown to react with sulfinyl orthoacetate 1 at 100-degrees-C sequentially via a [3,3] sigmatropic rearrangement and then a beta-elimination of benzenesulfenic acid to form conjugated dienoate esters 5-13 in 45-95% yields. This one-flask, intramolecular carbon-carbon bond-forming process represents a simple and convenient method for regiospecific gamma-attachment of a two-carbon (ethoxycarbonyl)methylene unit via the synthetic equivalent of an S(N)2' process. Two examples are given in which rationally designed dienoates 20 and 24, prepared via this one-flask process and carrying a pendant alkene unit, undergo intramolecular 2 + 4 cycloaddition producing bicyclic cyclohexenes 21 and 25.
Nagashima, Enkou; Suzuki, Kunio; Sekiya, Minoru, Chemical and pharmaceutical bulletin, 1981, vol. 29, # 5, p. 1274 - 1279
作者:Nagashima, Enkou、Suzuki, Kunio、Sekiya, Minoru
DOI:——
日期:——
Asymmetric total synthesis of an A-ring precursor to hormonally active 1.alpha.,25-dihydroxyvitamin D3