Diastereoselective Amidoalkylation of (3<i>S</i>,7a<i>R</i>)-6-Benzyl-7-hydroxy-3-phenyltetra- hydro-5<i>H</i>-imidazo[1,5-<i>c</i>][1,3]thiazol-5-one : A Short and Highly Efficient Synthesis of (+)-Biotin
作者:Subhash P. Chavan、Amar G. Chittiboyina、T. Ravindranathan、Subhash K. Kamat、Uttam R. Kalkote
DOI:10.1021/jo0488107
日期:2005.3.1
A short and highly efficient synthesis of (+)-biotin in 10 steps with 20% overall yield has been achieved from l-cysteine involving amidoalkylation of hydroxy imidazothiazolone 4 via an acyliminium ion intermediate to furnish C-7-substituted imidazothiazolones 5b as the key step.
的短而高效率的合成(+) -生物素在10个步骤以20%总产率已经从实现升涉及羟基imidazothiazolone的amidoalkylation -半胱氨酸4经由acyliminium离子中间体,得到C-7取代imidazothiazolones 5b的作为密钥步。