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µÚһƪ£ºA synthetic approach to paxilline indole diterpenes is described. The route to the pentacyclic core relies on a new regioselective alkenylation of ketones and a tandem radical addition¨Caldol reaction sequence to access vicinal quaternary stereocenters. Emindole SB, the simplest member of the family, is synthesized in 11 steps from commercially available material to demonstrate the application of this approach¡£ µÚ¶þƪ£ºThe selective preparation of 1,1,1-tris(boronates) from vinylarenes and bis(pinacolato)diboron is described. The reactions occur at ambient temperature with excellent selectivity, high yields, and good functional group tolerance. Mechanistic studies suggest that Co(I)-catalyzed double dehydrogenative borylations generate a 1,1-diborylalkene intermediate, which undergoes hydroboration with pinacolborane formed in situ to yield 1,1,1-tris(boronate). »Ø¸´Ê±Çë±ê×¢·ÒëµÄÊǵڼ¸Æª£¬¶àл¶àл£¬¾Ï¹ª |
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ÒüÉÙܰ: ½ð±Ò+10 2015-12-13 08:07:33
ÒüÉÙܰ: ½ð±Ò+10 2015-12-13 08:07:33
| ±¾ÎÄÑо¿ÁËÓÃvinylarenesºÍbis(pinacolato)diboronÑ¡ÔñÐÔÖÆ±¸1,1,1-tris(boronates)µÄ·½·¨¡£¸Ã·´Ó¦ÔÚÊÒÎÂϾßÓиßÑ¡ÔñÐÔ¡¢¸ß²úÂʼ°Á¼ºÃµÄ¹ÙÄÜÍÅÎȶ¨ÐÔ¡£»úÀíÑо¿±íÃ÷Co(l)´ß»¯µÄdouble dehydrogenative borylations·´Ó¦¹ý³ÌÖвúÉúÁË1,1-diborylalkene ÖмäÌ壬ËüÓëÔλÉú³ÉµÄpinacolborane·¢ÉúÅðÇ⻯·´Ó¦Éú³ÉÁË1,1,1-tris(boronate). ÍâÐРרҵ´Ê»ã¸ã²»¶¨ |
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3Â¥2015-12-13 10:36:06














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