Enolate Additions to a Chiral 3-Hydroxypropionate 2,3-Dication Equivalent. Enantioselective Synthesis of β,δ-Dihydroxy Esters
作者:W. Zhen、K.-H. Chu、M. Rosenblum
DOI:10.1021/jo9621940
日期:1997.5.1
The use of optically active dicarbonyl cyclopentadienyliron(vinyl ether) BF(4) salts, 3 and 4, as enantioselective 3-hydroxypropionate 2,3-dication equivalents is outlined. Complexes 3 and 4 are readily available by exchange etherification of 2, and these have been transformed to enantiomeric dicarbonyl (eta-cyclopentadienyliron)(eta(2)-1-methoxypropene) BF(4) 5 and ent-5. Complex 5 has been converted
概述了使用光学活性的二羰基环戊二烯基铁(乙烯基醚)BF(4)盐3和4作为对映选择性的3-羟基丙酸酯2,3-离子当量。配合物3和4可通过2的交换醚化而容易地获得,并且它们已被转化为对映体二羰基(η-环戊二烯基铁)(η(2)-1-甲氧基丙烯)BF(4)5和ent-5。通过交换醚化将络合物5转化为相应的对甲氧基苄氧基乙烯基醚络合物7。该盐与许多末端和非末端烯醇盐的缩合产生加合物,然后将其通过氧化还原促进的烷氧羰基化转化,然后进行醇脱保护,以形成光学活性的2-甲基-3-羟基-5酮酸酯。这些酮醇的1,3-还原可产生syn-1或anti-1,