期刊
ORGANIC LETTERS
卷 10, 期 21, 页码 5051-5054出版社
AMER CHEMICAL SOC
DOI: 10.1021/ol802079r
关键词
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资金
- JSPS [18350047]
- MEXT [20037003]
- Grants-in-Aid for Scientific Research [18350047, 20037003] Funding Source: KAKEN
A cationic gold(l) complex with a semihollow-shaped trialkynylphosphine catalyzed 5-exo-dig and 6-endo-dig cyclizations of various internal alkynic beta-keto esters, showing a marked advantage over a gold(I)-PPh3 complex with respect to the rates of the reactions and the product yields. It is proposed that the gold-bound alkynic substrate in a catalytic pocket must be somewhat folded and that such a steric effect makes the carbon-carbon bond formation entropically more favorable.
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