Chiral lithium amide base-mediated rearrangement of meso-cyclohexene oxides: asymmetric synthesis of amino- and aziridinocyclohexenols
作者:Peter O'Brien、Christopher D. Pilgram
DOI:10.1039/b210608f
日期:2003.1.30
aziridinocyclohexenols of 47-68% ee were obtained. Of particular note was the smooth rearrangement of the epoxide to an allylicalcohol in the presence of an aziridine: under optimised chiral base conditions, the aziridine remained essentially unaffected. A second more straightforward strategy for introduction of an amino functionality was also investigated: (1S,4R,5S)- and (1R,4R,5S)-4,5-bis(tert-b
Chiral base route to cyclic polyols: asymmetric synthesis of aminodeoxyconduritols and conduritol F
作者:Simon E de Sousa、Peter O'Brien、Christopher D Pilgram
DOI:10.1016/s0040-4039(01)01706-3
日期:2001.11
A chiral base route from a meso cyclohexene oxide to an allylic alcohol provides key intermediates for the synthesis of cyclic polyols. A Mitsunobu approach and an Overman rearrangement approach transform allylic alcohols into some aminodeoxyconduritols (95% ee). Elaboration of a chiral enone (89% ee) via (i) α-hydroxylation and (ii) stereoselective reduction completes a high yielding synthesis of
O'Brien, Peter; Poumellec, Pierre, Journal of the Chemical Society. Perkin transactions I, 1998, # 15, p. 2435 - 2441
作者:O'Brien, Peter、Poumellec, Pierre
DOI:——
日期:——
Optimisation of enantioselectivity for the chiral base-mediated rearrangement of bis-protected meso-4,5-dihydroxycyclohexene oxides: asymmetric synthesis of 4-deoxyconduritols and conduritol F
作者:Simon E de Sousa、Peter O'Brien、Christopher D Pilgram
DOI:10.1016/s0040-4020(02)00370-8
日期:2002.6
based on diastereoselective epoxidation of a cyclohexene followed by chiral lithium amide-mediated epoxide rearrangement has been used to synthesise an allylic alcoholbuildingblock of >95% ee. The key step is the enantioselective rearrangement of a bis-protected meso-4,5-dihydroxycyclohexene oxide. A range of protecting groups and chiral base structures were surveyed in order to find the optimum protocol
Chiral base-mediated rearrangement of meso-cyclohexene oxides to allylic alcohols
作者:Peter O'Brien、Pierre Poumellec
DOI:10.1016/0040-4039(96)01824-2
日期:1996.10
Highly enantiomerically enriched allylicalcohols have been generated by rearranging single diastereomers of meso-cyclohexene oxides using a homochiral lithium amide base. PDC oxidation of each allylicalcohol product affords a different enantiomer of a synthetically useful cyclohexenone.