کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5221530 | 1383423 | 2011 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Convergent synthesis of 2H-chromenes-a formal [3+3] cycloaddition by a one-pot, three-step cascade
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آلی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Convergent synthesis of 2H-chromenes-a formal [3+3] cycloaddition by a one-pot, three-step cascade Convergent synthesis of 2H-chromenes-a formal [3+3] cycloaddition by a one-pot, three-step cascade](/preview/png/5221530.png)
چکیده انگلیسی
In cases in which the palladium-catalyzed coupling of a bromoquinone with a vinyl stannane affords a vinyl quinone that enolizes, the resulting ortho-quinone methide undergoes an oxa-6Ï electrocyclization. Enolization is promoted by the presence of a polar additive. The net conversion is a formal [3+3] cycloaddition that gives 2H-chromenes. Because the first two steps of the cascade are catalyzed, the overall conversion is an example of multicatalysis. Yields for the optimized, one-pot protocol are dramatically improved over the conventional stepwise process.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Tetrahedron - Volume 67, Issue 51, 23 December 2011, Pages 9779-9786
Journal: Tetrahedron - Volume 67, Issue 51, 23 December 2011, Pages 9779-9786
نویسندگان
Kathlyn A. Parker, Thomas L. Mindt,