Use of 1,3-Dioxin-4-ones and Related Compounds in Synthesis. XLIV. Asymmetric Aldol Reaction of 4-Trimethylsiloxy-6-methylene-1,3-dioxines: Use of Tartaric Acid-Derived (Acyloxy)borane Complex as the Catalyst.
A novel enantioselective synthesis of 1, 3-dioxin-4-ones having a 2-hydroxylated alkyl group at the 6-position has been accomplished by chiral tartaric acid-derived acylborane-mediated aldol condensation of the silyl enol ether derived from 6-methyl-derivatives of 1, 3-dioxin-4-one with achiral aldehydes.
Bennett, Frank; Knight, David W.; Fenton, Garry, Journal of the Chemical Society. Perkin transactions I, 1991, # 3, p. 519 - 523
作者:Bennett, Frank、Knight, David W.、Fenton, Garry
DOI:——
日期:——
Enzyme-catalyzed lactonization of methyl (±)-(E)-3,5-dihydroxy-7-phenyl-6-heptenoates. - A comparison of the behaviour of syn- and anti-compounds
作者:Birgitta Henkel、Annamarie Kunath、Hans Schick
DOI:10.1016/s0957-4166(00)82325-3
日期:1993.2
3-Hydroxy lactones with a high enantiomeric excess were obtained by the lipase-catalyzed enantioselective lactonization of racemic syn- and anti-3,5-dihydroxy carboxylic esters. The (5S)-lactones were formed predominantly from both diols with pancreatin as enzyme. The lipase from Candida sp. 382, however, catalyzed the preferential formation of the (5S)-lactone only from the syn-diol. From the anti-diol the (5R)-lactone was formed as the main enantiomer.
Sato Masayuki, Sunami Satoshi, Sugita Yoshiaki, Kaneko Chikara, Chem. and Pharm. Bull, 42 (1994) N 4, S 839-845