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A convenient procedure to effect the Wittig and Horner¨CWadsworth¨CEmmons reactions employing guanidine TBD and MTBD as base promoters was developed.Mild reaction conditions highly efficiently facilitated isolation of the final products(Figure1.5) [38].Further developments of theWittig reactionhave beenreported [39, 40]. A proposed mechanism of Heck reaction and other reactions using palladium compounds as catalysts and running via surface transient organometallic (STO) intermediates is presented in Figure 1.7. The formation of only one STO intermediate in all the Heck-, Suzuki-, Sonogashira-, and Stille-type coupling reactions during their reaction sequences was stressed. Íò·Ö¸Ðл£¡ |
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»ðÉÏÆ®: ½ð±Ò+45, ·ÒëEPI+1, ¡ï¡ï¡ï¡ï¡ï×î¼Ñ´ð°¸, ·Ç³£¸Ðл£¡ 2016-05-01 13:43:59
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A convenient procedure to effect the Wittig and Horner¨CWadsworth¨CEmmons reactions employing guanidine TBD and MTBD as base promoters was developed.Mild reaction conditions highly efficiently facilitated isolation of the final products(Figure1.5) [38].Further developments of theWittig reactionhave beenreported [39, 40]. A proposed mechanism of Heck reaction and other reactions using palladium compounds as catalysts and running via surface transient organometallic (STO) intermediates is presented in Figure 1.7. The formation of only one STO intermediate in all the Heck-, Suzuki-, Sonogashira-, and Stille-type coupling reactions during their reaction sequences was stressed. ÓÐÈËÌá³öÁËÒ»ÖÖ¼ò±ãµÄ£¬ÀûÓÃëÒTBDºÍMTBD×÷Ϊ¼îÍÆ¶¯¼ÁÀ´´Ù½øWittigºÍHorner¨CWadsworth¨CEmmons ·´Ó¦µÄ·½·¨¡£ κ͵ķ´Ó¦Ìõ¼þ·Ç³£ÓÐÀûÓÚÖÕ²úÎïµÄ·ÖÀ루ͼ1. 5£©¡£»¹ÓÐÈËÌá³öÁ˶ÔWitting ·´Ó¦µÄ¸ü½øÒ»²½µÄ¸Ä½ø£¨·½·¨£©[39, 40]¡£ ͼ1.7 ½éÉÜÁËÒ»ÖÖ Õë¶ÔHeck·´Ó¦ºÍÆäËü·´Ó¦Ìá³öµÄ»úÀí£¬ÕâЩ·´Ó¦¶¼²ÉÓÃîÙ»¯ºÏÎï×÷Ϊ´ß»¯¼Á£¬ÖÐ;ÓбíÃæË²¼äÓлú½ðÊô(STO)Öмä²úÎïÐγɡ£ÌرðÇ¿µ÷Ö¸³öµÄÊÇÔÚÕâЩ·´Ó¦Àú³ÌµÄËùÓÐHeck-, Suzuki-, Sonogashira-, ºÍ Stille-Àà żÁª·´Ó¦ÖУ¬Ö»ÓÐÒ»ÖÖSTOÖмä²úÎïÐγɡ£ |
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