New synthetic route to (1r)--(-)-permethrin, (1r)--(+)-cypermethrin and (1r)--(+)-deltamethrin (decis) from (+)-3-care
作者:Arun K. Mandal、D.P. Borude、R. Armugasamy、N.R. Soni、D.G. Jawalkar、S.W. Mahajan、K.R. Ratnam、A.D. Goghare
DOI:10.1016/s0040-4020(01)88177-1
日期:1986.1
converted to (1R)-cis-(+)-(21) and (1R)-cis-(+)-(22) in seven steps and in an overall yields of 33% and 23%, respectively. These results coupled with the literature reports for the conversion of (1R)-cis-(+)-(21) and (22) to (1R)-cis-(-)-(1), (1R)-cis-(+)-cypermethrin (2) and (1R)-cis-(+)-deltamethrin (decis) (3) constitute two efficient methods for the synthesis of (1R)-cis-synthetic pyrethroid from (+)-3-carene
从(+)-3-carene(5)容易获得的(+)-4α-乙酰基-2-carene(6)被转化为(1R)-cis-(+)-3-(2',2 (11)和(22)的11个步骤中的'-(二卤代戊酰基)-2、2-二甲基-环丙烷-1-羧酸(21)和(22)的总收率分别为23%和14%。或者,将(+)-3-烯烃(5)的氧化产物(-)-5-酮-3-烯烃(23)在五次转化为(1R)-顺式-(-)-氯菊酯(1)步骤,总收率为20%。在另一种灵活的方法中,将(-)-(23)分为七个步骤,整体上分别转换为(1R)-顺式-(+)-(21)和(1R)-顺式-(+)-(22)产率分别为33%和23%。这些结果与文献报道有关将(1R)-顺式-(+)-(21)和(22)转化为(1R)-顺式-(-)-(1),