The enantioselective hydrophosphonylation of N-Boc imines was investigated using a new family of pseudo-symmetric guanidine–thiourea catalysts, providing α-amino phosphonates in moderate to high yields with good enantioselectivity. The catalyst was heterogenized by polymerization with styrene and the resulting catalyst was applied to reactions under continuous-flow conditions.
N -Boc 亚胺的对映选择性氢化膦酰化研究使用一类新的假对称胍-硫脲催化剂,以中等至高产率提供具有良好对映选择性的 α-氨基膦酸盐。通过与苯乙烯聚合使催化剂异质化,并将所得催化剂应用于连续流动条件下的反应。
Coumarin-based chiral fluorescence sensor incorporating a thiourea unit for highly enantioselective recognition of N-Boc-protected proline
New coumarin-based chiral thiourea sensor 1 was found to be an enantioselective fluorescent chemosensor for N-Boc-protected proline. The chiralsensor shows lower background fluorescence, and higher fluorescence enhancement with 18 nm blue shifts. Job plot analysis result indicates that sensor 1 can form a 1 : 1 stoichiometric complex and it could be used as a fluorescencesensor for the determination