4-Chloro-5 H -1,2,3-dithiazol-5-one:一种很好的α,β-不饱和β-氨基酯的α-硫氰化剂
摘要:
在120°C下于DMSO中用3-烷基(或芳基)-3-氨基-2-丙烯酸酯处理4-氯-5 H -1,2,3-二噻唑-5-酮,得到相应的2-硫氰酸酯4(主要)和5-烷氧基羰基-4-烷基(或芳基)-4-噻唑啉-2-酮5(次要),而在相同条件下在C-3带有强吸电子基团的酯得到5和/或4-取代的5-烷氧基羰基-2-氨基噻唑6,取决于吸电子基团。
A rapid access to substituted oxazoles via PIFA-mediated oxidative cyclization of enamides
摘要:
A facile and rapid access to multi-substituted oxazoles has been achieved under mild reaction conditions in a short reaction time. Reaction of enamides 1 with [bis(trifluoroacetoxy)iodo]benzene (PIFA) in trifluoroethanol (TFE) at room temperature for 15 min afforded the desired oxazoles 2 in moderate to excellent yields (58-98%). A wide range of functional group tolerance has been observed for these transformations. (C) 2017 Elsevier Ltd. All rights reserved.
CuI-catalyzed synthesis of multisubstituted pyrido[1,2-<i>a</i>]pyrimidin-4-ones through tandem Ullmann-type C–N cross-coupling and intramolecular amidation reaction
作者:Baichuan Mo、Chunxia Chen、Jinsong Peng
DOI:10.1039/d3ra04454h
日期:——
2-a]pyrimidin-4-ones were synthesized via a one-pot tandem CuI-catalyzed C–N bond formation/intramolecular amidation reaction at 130 °C in DMF. This protocol features simple operation, broad substrate scope, good functional group tolerance and gram scale preparation, thus allowing practical and modular synthesis of pyrido[1,2-a]pyrimidin-4-ones from readily available 2-halopyridine and (Z)-3-amino-3-arylacrylate
通过一锅串联 CuI 催化 C-N 键形成/分子内酰胺化反应在 130 °C DMF 中合成各种多取代吡啶并[1,2- a ]嘧啶-4-酮。该方案具有操作简单、底物范围广、官能团耐受性好和克级制备的特点,从而可以从容易获得的2-卤代吡啶和( Z )-吡啶并[1,2- a ]嘧啶-4-酮进行实用和模块化合成。 3-氨基-3-芳基丙烯酸酯的产率良好至优异。
Uracil derivatives and pesticides containing the same as active ingredient
申请人:NISSAN CHEMICAL INDUSTRIES, LIMITED
公开号:EP0438209A1
公开(公告)日:1991-07-24
Uracil derivatives of formula (I):
wherein A, B, R1 R2, Z1 and z2 are defined herein, are pesticides.
式 (I) 的尿嘧啶衍生物:
其中 A、B、R1 R2、Z1 和 z2 在此定义的农药。
Bae, Su-Hak; Kim, Kyongtae; Park, Young Ja, Heterocycles, 2000, vol. 53, # 1, p. 159 - 172
作者:Bae, Su-Hak、Kim, Kyongtae、Park, Young Ja
DOI:——
日期:——
US5116404A
申请人:——
公开号:US5116404A
公开(公告)日:1992-05-26
4-Chloro-5H-1,2,3-dithiazol-5-one: a good α-thiocyanating agent for α,β-unsaturated β-amino esters
作者:Young Seok Park、Kyongtae Kim
DOI:10.1016/s0040-4039(99)01235-6
日期:1999.8
Treatment of 4-chloro-5H-1,2,3-dithiazol-5-one with 3-alkyl (or aryl)-3-amino-2-propenoate esters in DMSO at 120°C gave the corresponding 2-thiocyanated esters 4 (major) and 5-alkoxycarbonyl-4-alkyl (or aryl)-4-thiazolin-2-ones 5 (minor), whereas the esters bearing a strong electron-withdrawing group at C-3 under the same conditions afforded 5 and/or 4-substituted 5-alkoxycarbonyl-2-aminothiazoles
在120°C下于DMSO中用3-烷基(或芳基)-3-氨基-2-丙烯酸酯处理4-氯-5 H -1,2,3-二噻唑-5-酮,得到相应的2-硫氰酸酯4(主要)和5-烷氧基羰基-4-烷基(或芳基)-4-噻唑啉-2-酮5(次要),而在相同条件下在C-3带有强吸电子基团的酯得到5和/或4-取代的5-烷氧基羰基-2-氨基噻唑6,取决于吸电子基团。