Highly diastereoselective synthesis of benzothiazolo[3,2-<i>a</i>]pyridines <i>via</i> [4 + 2] annulation reaction of 2-vinylbenzothiazoles and azlactones
benzothiazolo[3,2-a]pyridinederivatives was readily obtained in good to excellent yields (68–96%), with high diastereoselectivities and tolerating quite a broad scope of substituents. By using chiral phosphoric acid catalyst, the desired products were obtained in high enantioselectivities, up to −94%. This methodology provides a rapid and useful method for constructing fused benzothiazole derivatives.
Dryanska, Veneta, Phosphorus, Sulfur and Silicon and the Related Elements, 1991, vol. 61, # 3.4, p. 325 - 329
作者:Dryanska, Veneta
DOI:——
日期:——
Abdou, Wafaa M.; Ganoub, Neven A. F.; El-Khoshnieh, Yehia O., Synlett, 2003, # 6, p. 785 - 790
作者:Abdou, Wafaa M.、Ganoub, Neven A. F.、El-Khoshnieh, Yehia O.
DOI:——
日期:——
SYNTHESIS AND REACTIONS OF 2-FURANYLIDENECYANOMETHYL-1,3-BENZOTHIAZOLE WITH TER- AND PENTAVALENT PHOSPHORUS REAGENTS
作者:Neven A. Ganoub
DOI:10.1080/10426509908036997
日期:1999.5.1
Treatment of 2-furanylidenecyanomethyl-1,3-benzothiazole 1 with trialkyl phosphite 2 or dialkyl phosphonate 3 led to the formation of the corresponding-phosphonates 6a,b (E&Z) or 7a,b (E&Z) in high yields (similar to 70%). Only E-isomer of both types of phosphonates could be isolated in a pure form. Acrylonitrile 1 reacts with phosphorus ylides 4ab to afford the alkylidene derivatives 9a,b (similar to 58%) along with the pyridone derivative 10 (similar to 38%), meanwhile, with ylide 4c. The two pyridine derivatives 13a (41%) and 13b (54%) were isolated.
Enantioselective Reaction between 2-(Cyanomethyl)azaarenes and <i>N</i>-Boc-amino Sulfones
作者:Kezhou Wang、Chao Chen、Xihong Liu、Dan Li、Tianyu Peng、Xin Liu、Dongxu Yang、Linqing Wang
DOI:10.1021/acs.orglett.8b02205
日期:2018.9.7
benzothiazole or benzoxazole were designed and synthesized for asymmetric α-functionalization with N-Boc-amino sulfones. The Mannich adducts were obtained in high yields with good diastereo- and enantioselectivities. Aryl-substituted amino sulfones were tolerated under the current conditions, and the reaction can be performed on gram scale in good results.