A new simple and efficient synthesis of 6‐nitroindoles, starting from N‐carboxylalkylpyrrole‐2‐carboxaldehydes and protected β‐nitro ketones, has been developed. The method involves two distinct domino processes, respectively performed underflowchemicalconditions and microwave irradiation. 6‐Nitroindoles were produced in good to excellent overall yields.
NEW ARENO[e]INDOLS, PREPARATION METHOD AND APPLICATION AS INTERMEDIATES IN THE SYNTHESIS OF PRODUCTS WITH ANTITUMORAL ACTIVITY
申请人:PHARMA-MAR S.A.-PHARMAR
公开号:EP0623619A1
公开(公告)日:1994-11-09
The areno(e)indols have the formula (I). The methods comprises: (a) reacting (VI) with an aldehyde Ar''-CHO to obtain (VII); (b) oxidizing (VII) to yield the cetone (VIII); (c) reating (VIII) with a strong base and thereafter with an acyle chloride CICOR, to produce (IX); (d) subjecting to a photochemical cyclization (IX) to produce (I). In said formulas Ar is phenyl or substituted phenyl; Ar' is a radical (i) or )ii); R is an acyle group, Ar'' is a phenyl, pyrolyl, furanyl or thiophenyl group substituted up to three times by any of the radicals R, R¹, R², or R³. The compounds (I) are useful as intermediates in the synthesis of hexahydroareno(e)cyclopropa(c)indol-4-ones with antitumoral activity.