Stereoselective Crossed Aldol Reaction via Boron Enolates Generated from α-Iodo Ketones and 9-Borabicyclo[3.3.1]nonane
作者:Teruaki Mukaiyama、Tomofumi Takuwa、Keiko Yamane、Shouhei Imachi
DOI:10.1246/bcsj.76.813
日期:2003.4
2-iodo-1-(4-methoxyphenyl)propan-1-one, 2-iodopentan-3-one, 2-iodo-2-methyl-1-phenylpropan-1-one, 3,4-dihydro-2-iodo-1(2H)-naphthalenone, 2-iodo-1-phenylethan-1-one and 1-iodo-4-phenylbutan-2-one with 9-borabicyclo[3.3.1]nonane (9-BBN). Aldols were produced in good yields with good to high diastereoselectivities by subsequent reaction of boron enolates thus formed with various aldehydes. Several boron enolates derived
硼烯醇化物是通过处理各种 α-碘酮如 2-iodo-1-phenylpropan-1-one、2-iodo-1-(4-methoxyphenyl)propan-1-one、2-iodopentan- 3-one, 2-iodo-2-methyl-1-phenylpropan-1-one, 3,4-dihydro-2-iodo-1(2H)-naphthalenone, 2-iodo-1-phenylethan-1-one 和 1 -iodo-4-phenylbutan-2-one 与 9-borabicyclo[3.3.1]nonane (9-BBN)。通过由此形成的硼烯醇化物与各种醛的后续反应,以良好的收率和良好至高的非对映选择性生产了羟醛。通过蒸馏成功分离了几种衍生自 α-碘酮和频哪醇硼烷的硼烯醇化物,但产率相当适中。