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Chem."],"abstract":"<p>\n                    An efficient chiral squaramide-catalysed enantioselective Michael addition of pyrazolin-5-ones to 3-nitro-2\n                    <italic>H<\/italic>\n                    -chromenes afforded chiral heterocycles containing both chroman and pyrazolone derivatives in high to excellent yields (up to 98%) with high enantioselectivities (up to 96%) under very low catalyst loading (0.2 mol%).\n                  <\/p>","DOI":"10.1039\/c4ob02653e","type":"journal-article","created":{"date-parts":[[2015,4,9]],"date-time":"2015-04-09T08:02:09Z","timestamp":1428566529000},"page":"5636-5645","update-policy":"https:\/\/doi.org\/10.1039\/rsc_crossmark_policy","source":"Crossref","is-referenced-by-count":37,"title":["Enantioselective synthesis of chiral heterocycles containing both chroman and pyrazolone derivatives catalysed by a chiral squaramide"],"prefix":"10.1039","volume":"13","author":[{"given":"Jun-Hua","family":"Li","sequence":"first","affiliation":[{"name":"School of Chemical Engineering and Environment"},{"name":"Beijing Institute of Technology"},{"name":"Beijing 100081"},{"name":"People's Republic of China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Da-Ming","family":"Du","sequence":"additional","affiliation":[{"name":"School of Chemical Engineering and Environment"},{"name":"Beijing Institute of Technology"},{"name":"Beijing 100081"},{"name":"People's Republic of China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"292","published-online":{"date-parts":[[2015]]},"reference":[{"key":"C4OB02653E-(cit1a)\/*[position()=1]","doi-asserted-by":"crossref","first-page":"1338","DOI":"10.1016\/j.bmcl.2011.01.056","volume":"21","author":"Schmidt","year":"2011","journal-title":"Bioorg. 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