Chiral Bifunctional Thioureas and Squaramides and Their Copolymers as Recoverable Organocatalysts. Stereoselective Synthesis of 2Substituted 4Amino-3-Nitrobenzopyrans and 3Functionalized 3,4-Diamino4HChromenes

doi 10.1021/acs.joc.8b00567.s002
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American Chemical Society (ACS)