Chirality Transfer in Gold(I)-Catalysed Direct Allylic Etherifications of Unactivated Alcohols: Experimental and Computational Study
作者:Graeme Barker、David G. Johnson、Paul C. Young、Stuart A. Macgregor、Ai-Lan Lee
DOI:10.1002/chem.201501607
日期:2015.9.21
necessary to ensure efficient and general chirality transfer. Computationalstudies suggest that the efficiency of chirality transfer is linked to the aggregation of the alcohol nucleophile around the reactive π‐bound Au–allylic ether complex. With a single alcohol nucleophile, a high degree of chirality transfer is predicted. However, if three alcohols are present, alternative proton transfer chain mechanisms
An Efficient Approach to Chiral Allyloxyamines by Stereospecific Allylation of Nitrosoarenes with Chiral Allylboronates
作者:Yuanming Li、Shyamal Chakrabarty、Armido Studer
DOI:10.1002/anie.201410188
日期:2015.3.16
A novel and efficientapproach to allyloxyamines by the allylation of nitrosoarenes with α‐chiralallylboronates is described. CO bond formation occurs with high stereospecificity and the product allyloxyamines are easily transformed into valuable chiral building blocks such as isoxazolidines and allylic alcohols. The reaction features complete regioselectivity (O‐selectivity), high E/Z selectivity
Stereoselective Reactions of Acyclic Allylic Phosphates with Organocopper Reagents
作者:Jennifer L. Belelie、J. Michael Chong
DOI:10.1021/jo0104431
日期:2001.8.1
the size of R(2) affected both the regioselectivity and stereoselectivity of the displacement. Larger R(2) groups gave higher regio- and stereoselectivities: with R(2) = 3-pentyl, >98% S(N)2' regioselectivity and >98% anti stereoselectivity were observed. Bn(2)CuCNLi(2) gave stereoselectivities comparable to those observed with n-Bu(2)CuCNLi(2) but t-Bu(2)CuCNLi(2) exhibited much lower diastereofacial
3-Methyl-.gamma.-butyrolactones as templates for the synthesis of polypropionates: the basic strategy
作者:Frederick E. Ziegler、Alyssa. Kneisley、John K. Thottathil、Ronald T. Wester
DOI:10.1021/ja00224a031
日期:1988.8
Highly Stereoselective Anti S<sub>N</sub>2‘ Substitutions of (<i>Z</i>)-Allylic Pentafluorobenzoates with Polyfunctionalized Zinc−Copper Reagents
作者:Nicole Harrington-Frost、Helena Leuser、M. Isabel Calaza、Florian F. Kneisel、Paul Knochel
DOI:10.1021/ol034525i
日期:2003.6.1
[GRAPHICS]Allylic substitution reactions of zinc-copper organometallics on (Z)-allylic pentafluorobenzoates proceed with very high regioselectivity and excellent anti selectivity. The high fidelity in transfer of stereochemical information allowed a short synthesis of (+)-ibuprofen (97% ee).