Published in Blood Weekly, August 14th, 2008
"Protected ethylenediamine derivatives and N-Boc-serinol dimesylate underwent rapid cyclization to give 6-aminoperhydro-1,4-diazepine derivatives in excellent yields and with high selectivity, whereas the same reaction failed or gave negligible yields under conventional heating. Cesium or potassium ions catalyzed the ring closure by coordinating the sulfonamide groups. All relevant work reported to date...
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Source: Blood Weekly (2008-08-14)
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