Stereochemistry of the Cyclization-Rearrangement of (+)-Copalyl Diphosphate to (−)-Abietadiene Catalyzed by Recombinant Abietadiene Synthase from <i>Abies grandis</i>
作者:Matthew M. Ravn、Robert M. Coates、Janice E. Flory、Reuben J. Peters、Rodney Croteau
DOI:10.1021/ol991230p
日期:2000.3.1
[reaction: see text] Syntheses and enzymatic cyclizations of 8alpha-hydroxy-17-nor copalyl diphosphate (8a), (15R)-[15-2H1] 8b, and (15R,17E)-[15-3H1,17-2H1] copalyl diphosphate ([2H,3H] 2) catalyzed by recombinant abietadiene synthase (rAS) gave 17-nor manoyl oxide (9a), (16E)-[16-2H1] 9b, and (15S,16R)-[16-2H1,16-3H1] abietadiene ([2H1,3H1] 4), respectively. These and other results indicate that
[反应:请参阅文本] 8alpha-hydroxy-17-nor copalyl diphosphate(8a),(15R)-[15-2H1] 8b和(15R,17E)-[15-3H1,17-2H1]的合成和酶环化重组abietadiene合酶(rAS)催化的]磷酸二氢棕榈酸棕榈酯([2H,3H] 2)得到17-正氧化锰(9a),(16E)-[16-2H1] 9b和(15S,16R)-[16- 2H1,16-3H1]己二烯([2H1,3H1] 4)。这些结果和其他结果表明,CPP(2)转化为双癸二烯(4)的发生是通过反S(N)'环化为sandaracopimar-15-en-8-基碳正离子化中间体(13+,13β-甲基),然后是氢在乙烯基的表面上转移和甲基迁移。