Benzopyrans

Details Benzopyrans Benzopyrans

C - Chemistry, Metallurgy

07

D

167/207, 260/328

C07D 311/24 (2006.01) C07D 311/92 (2006.01) C07D 311/94 (2006.01) C07D 491/04 (2006.01) C07D 493/04 (2006.01) C07D 495/04 (2006.01)

Patent

CA 1250584

ABSTRACT (84/02557/N America) There are provided benzopyrans of formula I, Image I wherein an adjacent pair of R5, R6, R7 and R8 represent the chain -X-CR12R13-CR14R15-Y-in which the chain is substituted by -A1E1, X represents CR10R11 or a single bond, Y represents O, S or CR16R17, and (a) R10 and R12 together form a single bond or (b) R12 and R14 together form a single bond, or (c) R10, R12 and R14 each represent hydrogen; and the remainder of R10, R11, R12, R13, R14, R15, R16 and R17, which may be the same or different, independently represent hydrogen, alkyl, NR21COR22, CN or CnHxF(2n+1-x); in addition, a geminal pair of R10, R11, R12, R13, R14, R15, R16, and R17 together with the carbon atom to which they are attached, may represent C=O or C=N-OR23; also a vicinal pair of R11, R13, R15 and R17, may form the chain -CH=CH-CH=CH- which is substituted by A1E1,

473177

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