金属酶是化学家的灵感源泉,他们试图创建用于水性催化的通用合成催化剂。本文中,我们通过将Fe(II)离子掺入手性含恶唑啉的离散自折叠聚合物中,赋予手性Fe II-恶唑啉配合物类似金属酶的特性,以实现水中的高对映选择性磺胺-迈克尔加成(SMA)。铁链内的Fe II-恶唑啉配合物与疏水相互作用共同触发了含恶唑啉的单聚合物链在水中的自折叠。所形成的Fe II -folded单链聚合物纳米颗粒(SCPNs)显著加速含水不对称SMA反应通过催化位周围的自折叠疏水区室,让人想起金属酶催化。另外,由于它们的热响应特性,它们可以通过简单的温控分离而容易地回收再利用。这种金属折叠的SCPN结合了过渡金属催化剂和生物催化剂的优点,并且避免了繁琐的分离程序,这对节能和工业应用是有益的。
Asymmetric Michael reactions and enantioselective protonations between enones and thiols were catalyzed by a Sc(OTf)3–chiral 2,2′-bipyridine complex in water. The remarkable governing of the enantioselectivity for simple introduction of protons despite their abnormally high mobility in water may provide us with new synthetic opportunities as well as significant chemical advances.
β-dicarbonyl compounds. The use of these chiral iron–salen complexes as catalysts provides a new method for conducting these three important reactions under environmentally sustainable conditions. Iron(III)–salen complexes based on a chiral cis-2,5-diaminobicyclo[2.2.2]octane scaffold are used as catalysts for a variety of stereoselective reactions. High enantio- and diastereoselectivities can be achieved with
A Bifunctional Cinchona Alkaloid-Squaramide Catalyst for the Highly Enantioselective Conjugate Addition of Thiols to trans-Chalcones
作者:Le Dai、Su-Xi Wang、Fen-Er Chen
DOI:10.1002/adsc.201000334
日期:2010.9.10
A chiral squaramide catalysts‐promoted asymmetric sulfa‐Michael conjugated addition of thiols to trans‐chalcones is presented. Moderate to excellent yields and high enantioselectivities (up to 99% ee) were achieved under mild conditions.
Iron(<scp>ii</scp>)-folded single-chain nanoparticles: a metalloenzyme mimicking sustainable catalyst for highly enantioselective sulfa-Michael addition in water
source of inspiration for chemists who attempt to create versatile synthetic catalysts for aqueous catalysis. Herein, we impart metalloenzyme-like characteristics to a chiral FeII–oxazoline complex by incorporating an Fe(II) ion into a chiral oxazoline-containing discrete self-folded polymer, to realize highly enantioselective sulfa-Michaeladdition (SMA) in water. Intrachain FeII–oxazoline complexation
金属酶是化学家的灵感源泉,他们试图创建用于水性催化的通用合成催化剂。本文中,我们通过将Fe(II)离子掺入手性含恶唑啉的离散自折叠聚合物中,赋予手性Fe II-恶唑啉配合物类似金属酶的特性,以实现水中的高对映选择性磺胺-迈克尔加成(SMA)。铁链内的Fe II-恶唑啉配合物与疏水相互作用共同触发了含恶唑啉的单聚合物链在水中的自折叠。所形成的Fe II -folded单链聚合物纳米颗粒(SCPNs)显著加速含水不对称SMA反应通过催化位周围的自折叠疏水区室,让人想起金属酶催化。另外,由于它们的热响应特性,它们可以通过简单的温控分离而容易地回收再利用。这种金属折叠的SCPN结合了过渡金属催化剂和生物催化剂的优点,并且避免了繁琐的分离程序,这对节能和工业应用是有益的。