Reactivity of Morita–Baylis–Hillman Adducts in C–H Functionalization of (Hetero)aryl Nitrones: Access to Bridged Cycles and Carbazoles
作者:Ashok Kumar Pandey、Dahye Kang、Sang Hoon Han、Heeyoung Lee、Neeraj Kumar Mishra、Hyung Sik Kim、Young Hoon Jung、Sungwoo Hong、In Su Kim
DOI:10.1021/acs.orglett.8b01910
日期:2018.8.3
nitrones with Morita–Baylis–Hillman (MBH) adducts is described. An allylated intermediate derived from aryl nitrones and MBH adducts allows the formation of bridged cyclic compounds via an exotype [3 + 2] cycloaddition. In sharp contrast, electron-rich indolinyl or aniline substrates were found to couple with MBH adducts to generate naphthalene or carbazole derivatives, respectively.
A compound represented by the figure (1) or a pharmaceutically acceptable salt thereof is useful as medicament for treating retinal degenerative disorders:
wherein Ar is optionally substitued phenyl or optionally substituted heteroaryl;.
n is 0, 1 or 2;
W is —CH2NH— or —CH═N(O)—;
R1, R2 and R3 are independently optionally substituted alkyl, carboxyl or alkoxycarbonyl; any two groups of R1, R2 and R3 may be taken together with the carbon atom to form optionally substituted cycloalkane; all of R1, R2 and R3 may be taken together with the adjusent carbon atom to form optionally substituted bicycloalkane or optionally substituted tricycloalkane;
R4 and R5 are independently hydrogen atom or optionally substituted alkyl.