Chemico-enzymatic syntheses of racemic and chiral isomers of 7- methyl-1,6-dioxaspiro[4.5]decane
摘要:
Porcine pancreatic lipase (PPL) mediated resolution of 6-heptene-2-ol afforded the enantiomers in high optical purities. Alkylation products of the dianion of the 2-4'-hydroxypentyl-1,3-dithiane prepared from the enantiomers, followed by alkylative hydrolysis, afforded 97% optically pure E-7-methyl-1,6-dioxaspiro[4.5]decane.
Chemico-enzymatic syntheses of racemic and chiral isomers of 7- methyl-1,6-dioxaspiro[4.5]decane
摘要:
Porcine pancreatic lipase (PPL) mediated resolution of 6-heptene-2-ol afforded the enantiomers in high optical purities. Alkylation products of the dianion of the 2-4'-hydroxypentyl-1,3-dithiane prepared from the enantiomers, followed by alkylative hydrolysis, afforded 97% optically pure E-7-methyl-1,6-dioxaspiro[4.5]decane.
Synthesis of macrocycles via allylic radical intermediates. A total synthesis of (−)-zearalenone
作者:Stephen A Hitchcock、Gerald Pattenden
DOI:10.1016/s0040-4039(00)94465-4
日期:1990.1
A concise synthesis of optically active (−)-zearalenone (1) which uses a novel 14- trig macrocyclisation from an allylic radical intermediate (Scheme 1) as a key feature, is described.
Refined enantioselective methylation catalysts: improved routes to bifunctional C5 synthons
作者:Graham B Jones、Mustafa Guzel、Brant J Chapman
DOI:10.1016/s0957-4166(98)00076-7
日期:1998.3
Catalytic enantioselective routes to bifunctional C5 synthons, including those of the macrolide (S)-(−)-zearalenone have been achieved. Stereochemistry was introduced using a mixed ligand arene chromium tricarbonyl catalyst to mediate the enantioselective addition of dimethyl zinc to a functionalized aldehyde. Comparison with alternate reduction strategies is presented.