A new route to chiral bis-tertiary phosphine ligands: synthesis, resolution, and crystal structure of trans-bis-1,2-(diphenylphosphino)-cyclopentane and the nickel adduct NiBr2[trans-1,2-(PPh2)2C5H8]
作者:David L. Allen、Vernon C. Gibson、Malcolm L. H. Green、James F. Skinner、Jim Bashkin、Peter D. Grebenik
DOI:10.1039/c39830000895
日期:——
Heating of white phosphorus, phosphorus trichloride, and cyclopentene at 220 °C gives trans-1,2-bis (dichlorophosphino)cyclopentane (1), which with phenylmagnesium bromide gives trans-1,2-bis(diphenylphosphino)-cyclopentane (dpcp)(2); compound (2)forms the adduct Ni(dpcp) Br2·CH2Cl2, which readily crystallizes as a conglomerate and the pure enantiomers may be separated by hand allowing resolution of
在220°C下加热白磷,三氯化磷和环戊烯,得到反式-1,2-双(二氯膦基)环戊烷(1),与苯基溴化镁一起得到反式-1,2-双(二苯基膦基)-环戊烷(dpcp) (2); 化合物(2)形成加合物Ni(dpcp)Br 2 ·CH 2 Cl 2,其易于结晶成团块,可以用手分离纯对映异构体,从而拆分出(2),并进行甲基(N-苯甲酰基)的催化加氢)脱氢苯丙氨酸使用拆分(2)和铑催化剂得到的氢化产物的光学纯度为100%。