The reaction of enynes with aldehydes in the presence of a catalytic amount of [RhCl(cod)](2)/dppp results in the Pauson-Khand-typereaction without the use of gaseous carbon monoxide to give bicyclic cyclopentenones in high yields (14 examples). Aldehydes serve as a source of carbon monoxide, and their carbonyl moiety is transferred to enynes, resulting in the formation of the carbonylated products
在催化量的 [RhCl(cod)](2)/dppp 存在下,烯炔与醛的反应会导致 Pauson-Khand 型反应,而无需使用气态一氧化碳,以高产率得到双环环戊烯酮 (14例子)。醛作为一氧化碳的来源,它们的羰基部分被转移到烯炔,导致形成羰基化产物。该反应代表了 CO 转移羰基化的第一个例子。
Catalytic asymmetric Pauson–Khand-type reactions of enynes with formaldehyde in aqueous media
The first example of an aqueous, asymmetric, and CO gas-free Pauson–Khand-typereaction is described. Using formaldehyde as a commercially available substitute for carbon monoxide, combined use of a hydrophilic phosphine (TPPTS) and a hydrophobic, chiral phosphine (tolBINAP) enable the reaction to proceed smoothly in aqueous media, even in the absence of carbon monoxide, and stereoselectively.
Catalytic cyclocarbonylation reactions using a glyceraldehyde derivative as a carbonyl source are described. The rhodium(I)-catalyzed reaction of enynes with glyceraldehyde acetonide gave bicyclic cyclopentenones as the products. This presents an interesting use of a sugar alcohol derived carbon resource as well as a convenient procedure for the cyclocarbonylation of enynes. rhodium - cyclocarbonylation
The reaction of 1,6-enynes with formaldehyde in the presence of a cationic Rh(I) catalyst, such as [Rh(cod)2]+OTf−, and a chiral biaryl diphosphine led to asymmetric cyclohydroformylation to produce aldehydes with higher-order structures highly enantioselectively.
Aqueous Catalytic Pauson–Khand-Type Reactions of Enynes with Formaldehyde: Transfer Carbonylation Involving an Aqueous Decarbonylation and a Micellar Carbonylation