ORGANIC SYNTHESES VIA TRANSITION-METAL COMPLEXES .53. 4-METHYLENECYCLOPENTENES AND 5-METHYLENECYCLOHEXENONES FROM FISCHER CARBENE CHROMIUM COMPLEXES, ALLENES, AND ALKYNES

被引：8

作者：

AUMANN, R

TRENTMANN, B

机构：

[1] Organisch-Chemisches Institut, Universität Münster, Münster, W-4400

来源：

CHEMISCHE BERICHTE-RECUEIL | 1991年 / 124卷 / 10期

关键词：

CYCLOPENTENES; 4-METHYLENECYCLOPENTENES; SYNTHESIS OF; CYCLOHEXENONES; 5-METHYLENECYCLOHEXENONES; TRI(METHYLENE)-METHANE CHROMIUM COMPLEXES; 3+2]CYCLOADDITIONS WITH TRI(METHYLENE)METHANE COMPLEXES; CARBENE CHROMIUM COMPLEXES FOR ORGANIC SYNTHESIS;

D O I：

10.1002/cber.19911241029

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

A method is described for the two-step construction of 4-methylenecyclopentenes 6 and 5-methylenecyclohexenones 7 from Fischer carbene chromium complexes, allenes, and alkynes. In the first step a tri(methylene)methane complex 3 is generated by the addition of the carbene chromium complex (CO)5Cr = C(OEt)Ph (1) to the allene 2. The second step involves an addition of 3 to alkynes HC = CR [5: R = Ph (a), SiMe3 (b)] at 75-degrees-C to give 6 and/or 7 in high chemical yields. The product ratios strongly depend on the substituents R.

引用

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页码：2335 / 2342

页数：8

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