کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5223376 | 1383484 | 2009 | 7 صفحه PDF | دانلود رایگان |
Alkylation at C6 of tricyclo[5.2.1.02,6]deca-4,8-dien-3-one (R=H) was achieved by treatment of 6-bromotricyclo[5.2.1.02,6]deca-4,8-dien-3-one with lithium dimethylcuprate and subsequently with an appropriate electrophile. The best results were obtained in THF as the solvent. A wide range of alkyl halides, bromo ketones and esters, and acetyl chloride resulted in C6-tricyclo[5.2.1.02,6]deca-4,8-dien-3-ones in moderate to good yields. This alkylation reaction proceeds via a C6-carbanionic Cu intermediate, which is likely stabilized by the enone olefinic bond. 6-Bromo-endo-tricyclo[5.2.1.02,6]dec-8-en-3-one, which lacks this double bond, behaves differently. Treatment with lithium dimethylcuprate leads to dehydrobromination to give tricyclo[5.2.1.02,6]deca-2(6),8-dien-3-one in high yield.
Journal: Tetrahedron - Volume 65, Issue 1, 3 January 2009, Pages 389-395