Highly Diastereoselective Synthesis of Dihydro‐benzoimidazo‐[1,3]‐thiazines via Electro‐oxidative Selenocyclization of Thioallyl Benzoimidazoles
作者:Atreyee Halder、Kingshuk Mahanty、Debabrata Maiti、Suman De Sarkar
DOI:10.1002/asia.202101033
日期:2021.12
A series of dihydro-benzoimidazo-thiazine derivatives displaying exclusive diastereoselectivity has been synthesized proficiently via external chemical oxidant and metal-free selenocyclization methodology. This mild electro-oxidative protocol operates in an undivided electrochemical cell at ambient temperature under air, exhibiting decent functional group tolerance and excellent yields.
A Convenient Synthesis of 3-Methylthiazolo[3,2-<i>a</i>]benzimidazoles, 3-Benzylthiazolo[3,2-<i>a</i>]benzimidazoles, and 4-Phenylthiazeno [3,2-<i>a</i>]benzimidazoles
作者:K. K. BALASUBRAMANIAN、R. NAGARAJAN
DOI:10.1055/s-1976-23983
日期:——
BALASUBRAMANIAN K. K.; NAGARAJAN R., SYNTHESIS <SYNT-BF>, 1976, NO 3, 189
作者:BALASUBRAMANIAN K. K.、 NAGARAJAN R.
DOI:——
日期:——
Straightforward Approach to 5-Substituted 7H-Imidazo[2,1-b] [1,3]thiazines via Cyclization of 2-Alkynylthioimidazoles
Electrophile-initiated nucleophilic cyclization of 2-alkynylthiobenzimidazoles is a useful tool for synthesizing new heterocyclic systems. However, halogen-initiated cyclization demonstrates poor selectivity between electrophilic addition and substitution reactions using otherimidazoleanalogues. In this research, several different coinage metal catalysts were employed to broaden the scope of 7H-imidazo[2
2-炔基硫代苯并咪唑的亲电引发的亲核环化是合成新杂环系统的有用工具。然而,卤素引发的环化表明使用其他咪唑类似物的亲电加成和取代反应之间的选择性较差。在这项研究中,采用了几种不同的造币金属催化剂,以原子经济的方式拓宽了7 H-咪唑并[2,1- b ][1,3]噻嗪的范围。使用各种 2-炔基硫代咪唑,以 AuCl 作为催化剂,在 DCE/DCM 中以良好至优异的产率实现了选择性 6- end -dig 途径反应。