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Catalytic asymmetric alkenylations, aldehydes

Table 2 Catalytic asymmetric alkenylation of various aldehydes... Table 2 Catalytic asymmetric alkenylation of various aldehydes...
A new class of efficient aminothiol ligands has been used in asymmetric alkenyl addition to aldehydes with very low catalytic loading of 1 mol%.114 Efficient formation of chiral (T )-allylic alcohols with ees of up to 99% has been achieved in the presence of (43). [Pg.267]

In analogy t 0 the Cu(II) complex systems, the silver(I) -catalyzed aldol reaction is also proposed to proceed smoothly through a Lewis acidic activation of carbonyl compounds. Since Ito and co-workers reported the first example of the asymmetric aldol reaction of tosylmethyl isocyanide and aldehydes in the presence of a chiral silver(I)-phosphine complex (99,100), the catalyst systems of sil-ver(I) and chiral phosphines have been applied successfully in the aldol reaction of tin enolates and aldehydes (101), Mukaiyama aldol reaction (102), and aldol reaction of alkenyl trichloroacetates and aldehydes (103). In the Ag(I)-disphosphine complex catalyzed aldol reaction, Momiyama and Yamamoto have also examined an aldol-type reaction of tin enolates and nitrosobenzene with different silver-phosphine complexes (Scheme 15). The catalytic activity and enantioselectivity of AgOTfi(f )-BINAP (2 1) complex that a metal center coordinated to one phosphine and triflate were relay on solvent effect dramatically (Scheme) (104). One catalyst system solves two problems for the synthesis of different O- and AT-nitroso aldol adducts under controlled conditions. [Pg.2216]


See other pages where Catalytic asymmetric alkenylations, aldehydes is mentioned: [Pg.106]    [Pg.737]    [Pg.382]    [Pg.494]    [Pg.304]    [Pg.256]    [Pg.264]    [Pg.72]    [Pg.142]    [Pg.72]    [Pg.373]   


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Aldehyde catalytic asymmetric

Aldehydes alkenylation

Aldehydes asymmetric

Alkenylation, asymmetric

Asymmetric catalytic

Catalytic aldehyde

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