在氯化锡(IV)和三乙胺存在下,2-苯甲酰胺基-4,5-二氢-3-噻吩(和-3-呋喃)腈(1a-c和4a-c)与乙酰乙酸乙酯的反应提供了相应的2-(5,6-二氢-2-苯基噻吩并(和呋喃)[2,3 - d ]嘧啶-4-基)-3-氧代丁酸乙酯(2a-c和9a-c)。类似地,化合物1a-c和4a-c与丙二酸二烷基酯反应生成相应的二烷基(5,6-二氢-2-苯基噻吩并(呋喃)[2,3 - d ]嘧啶-4-基)丙二酸酯(5a- c,6a-c,10a-c和11a-c)。
An efficient synthesis of 4‐alkoxy‐5,6‐dihydro‐furo(and ‐thieno)[2,3‐
<i>d</i>
]pyrimidines using zinc chloride/triethylamine reagent system
作者:Hiroshi Maruoka、Fumi Okabe、Kenji Yamagata
DOI:10.1002/jhet.5570450237
日期:2008.3
Abstractmagnified imageThe one‐pot synthesis of 4‐alkoxy‐5,6‐dihydro‐furo(and ‐thieno)[2,3‐d]pyrimidines is described. The reactions of 2‐benzamido‐4,5‐dihydro‐3‐furan(and ‐3‐thiophene)carbonitriles 1a‐d and 2a‐c with ethanol and/or methanol in the presence of zinc chloride and triethylamine gave the corresponding 4‐alkoxy‐5,6‐dihydro‐furo(and ‐thieno)[2,3‐d]pyrimidines 3a‐d, 4a‐d, 5a‐c and 6a‐c.
Yamagata, Kenji; Hashimoto, Yoshichika; Yamazaki, Motoyoshi, Liebigs Annalen der Chemie, 1994, # 8, p. 791 - 794