Achiral counterion control of enantioselectivity in a Brønsted acid-catalyzed iodolactonization.
Achiral counterion control of enantioselectivity in a Brønsted acid-catalyzed iodolactonization.
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DOI:
10.1021/ja301858r
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发表时间:
2012-04-11
影响因子:
15
通讯作者:
Johnston, Jeffrey N.
中科院分区:
文献类型:
--
作者:
Dobish, Mark C.;Johnston, Jeffrey N.
Highly enantioselective halolactonizations have been developed using a chiral proton catalyst NIS reagent system in which the Brønsted acid is used at catalyst loadings as low as 1 mol%. An approach that modulates the achiral counterion (equimolar to the neutral chiral ligand proton complex present at low catalyst loadings) to optimize enantioselection is documented for the first time in this transformation. In this way, unsaturated carboxylic acids are converted to γ-lactones in high yield (up to 98% ee) using commercially available N-iodosuccinimide (NIS).
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影响因子:
8.4
作者:
Davis TA;Johnston JN
通讯作者:
Johnston JN
影响因子:
15
作者:
Chen, Zhi-Min;Zhang, Qing-Wei;Tian, Jin-Miao
通讯作者:
Tian, Jin-Miao
DOI:
10.1126/science.1188403
发表时间:
2010-06-04
期刊:
Science (New York, N.Y.)
影响因子:
--
作者:
Gustafson JL;Lim D;Miller SJ
通讯作者:
Miller SJ
DOI:
10.1073/pnas.1005296107
发表时间:
2010-11-30
影响因子:
11.1
作者:
Denmark, Scott E.;Burk, Matthew T.
通讯作者:
Burk, Matthew T.
影响因子:
15
作者:
Nugent, BM;Yoder, RA;Johnston, JN
通讯作者:
Johnston, JN