The Internal Michael Reaction. II. Formation of Arylated Coumarans, of an Indoline, a Dihydrothionaphthene and a Hydrocarbostyril1

CF Koelsch, CR Stephens Jr

文献索引：Koelsch; Stephens Journal of the American Chemical Society, 1950 , vol. 72, p. 2209,2211

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被引用次数: 8

摘要

When ethyl coumarinate or a related ester (I) with an alkyl substituent on either or both the a- and @-carbons is treated with sodium alkoxide, an internal Michael reaction takes place, and a coumaran (11) is formed.2 ... R3 I I1 It has now been found that the same reaction can be effected with I when R1 or Rz is a phenyl. The first case (I, RI = C6H6, RP = H, R3 = CHs) is noteworthy because no example of the Michael reaction has been discovered previously in which the ...