Reactions of <i>t</i>-BuOK and Dibenzyl, Benzyl Allyl, and Allyl β-Keto Sulfide Complexes of the Chiral Rhenium Lewis Acid [(η<sup>5</sup>-C<sub>5</sub>H<sub>5</sub>)Re(NO)(PPh<sub>3</sub>)]<sup>+</sup>: Highly Diastereoselective or Chemoselective [2,3]-Sigmatropic Rearrangements
作者:Phillip C. Cagle、Oliver Meyer、Dominique Vichard、Konrad Weickhardt、Atta M. Arif、J. A. Gladysz
DOI:10.1021/om950701i
日期:1996.1.9
reactions of the benzyl allyl sulfide complexes [(η5-C5H5)Re(NO)(PPh3)(S(CH2CRCH2)CH2Ph)]+TfO- (R = H, CH3) give mainly the thiolates (SS,RR)-(η5-C5H5)Re(NO)(PPh3)(SCH(CH2CRCH2)Ph), derived from benzyl group deprotonation. Some thiolates derived from allyl group deprotonation also form. Similar reactions of the allyl β-keto sulfide complexes [(η5-C5R5)Re(NO)(PPh3)(S(CH2CR‘CR‘‘2)CH2COPh)]+X- (R/R‘/R‘‘ = H/H/H
的二苄基硫醚复合物的反应[(η 5 -C 5 H ^ 5)的Re(NO)(PPH 3)(S(CH 2 PH)2)] + TFO - (4A + TFO - )和吨-BuOK(THF, -80℃),得到硫醇盐(η 5 -C 5 H ^ 5)的Re(NO)(PPH 3)(SCH(直径: -C 6 H ^ 4 CH 3)PH)(5A ; 99%),为96:4 SR混合,RS / SS,RRRe:C非对映体。该转化涉及苄基的初始去质子化以产生内酰胺,随后是[2,3]-和[1,3]-重排。(SR,RS)-5a的晶体结构确定了构型。的苄基烯丙基硫醚配合物[(η类似的反应5 -C 5 H ^ 5)的Re(NO)(PPH 3)(S(CH 2 CR CH 2)CH 2 PH)] + TFO -(R = H,CH 3)主要得到硫醇盐(SS,RR) - (η 5 -C 5 H ^ 5衍生自苄基去质子化的)Re(NO)(PPh