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One-pot synthesis of 4-substituted 4-alkoxy-1,4-dihydro-3,1-benzoxazine-2- thiones by the reaction of 2-isothiocyanatobenzoates with organolithiums¡£ An efficient one-pot procedure for the preparation of 4-substituted 4-alkoxy-1,4-dihydro-3,1-benzoxazine-2-thiones from 2-isothiocyanatobenzoates has been developed. Thus, 2-isothiocyanatobenzoates were reacted with organolithiums including lithium enolates of acetates and tertiary acetamides in THF at 78 C to give the desired products in generally good yields. |
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sltmac
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hmily601(½ð±Ò+5, ·ÒëEPI+1): 2011-07-01 19:03:26
Mally89(½ð±Ò+1): ¡¢¡¢¡¢ 2011-07-04 16:49:14
hmily601(½ð±Ò+5, ·ÒëEPI+1): 2011-07-01 19:03:26
Mally89(½ð±Ò+1): ¡¢¡¢¡¢ 2011-07-04 16:49:14
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2Â¥2011-07-01 08:06:05
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sltmac(½ð±Ò+1): лл~~ 2011-07-01 09:16:05
hmily601(½ð±Ò+10): 2011-07-01 19:03:30
sltmac(½ð±Ò+1): лл~~ 2011-07-01 09:16:05
hmily601(½ð±Ò+10): 2011-07-01 19:03:30
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One-pot synthesis of 4-substituted 4-alkoxy-1,4-dihydro-3,1-benzoxazine-2- thiones by the reaction of 2-isothiocyanato benzoates with organolithiums¡£ ͨ¹ý2-ÒìÁòÇèËáõ¥±½¼×ËáÑÎÓëÓлúï®·´Ó¦Ò»¹ø·¨ºÏ³É4-È¡´ú-1,4-¶þÇâ-3,1-±½²¢¶ñàº-2-Áòͪ An efficient one-pot procedure for the preparation of 4-substituted 4-alkoxy-1,4-dihydro-3,1-benzoxazine-2-thiones from 2-isothiocyanatobenzoates has been developed. ±¾ÎĽ¨Á¢ÁËÓÉ2-ÒìÁòÇèËáõ¥±½¼×ËáÑÎÖÆ±¸4-È¡´ú-1,4-¶þÇâ-3,1-±½²¢¶ñàº-2-ÁòͪµÄÒ»¹øºÏ³É·¨¡£ Thus, 2-isothiocyanatobenzoates were reacted with organolithiums including lithium enolates of acetates and tertiary acetamides in THF at 78 C to give the desired products in generally good yields. 2-ÒìÁòÇèËáõ¥±½¼×ËáÑÎÓë°üÀ¨ï®Ï©´¼»¯ÎïµÄÒÒËáÑκÍÈýÒÒõ£°·ÔÚËÄÇâß»à«ÖÐÓÚ78¡æÏ·´Ó¦ÒÔͨ³£½ÏºÃµÄ²úÂʵõ½ÒªÇóµÄ²úÎï¡£ |
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