Recent progress on the total synthesis of acetogenins from Annonaceae

• Nianguang Li,
• Zhihao Shi,
• Yuping Tang,
• Jianwei Chen and
• Xiang Li

Beilstein J. Org. Chem. 2008, 4, No. 48, doi:10.3762/bjoc.4.48

Radical cascades using enantioenriched 7-azabenzonorbornenes and their applications in synthesis

• David M. Hodgson and
• Leonard H. Winning

Beilstein J. Org. Chem. 2008, 4, No. 38, doi:10.3762/bjoc.4.38

• , resulting in electrophile trapping rather than reduction. Encouraged by the above initial result, a number of other electrophiles were considered for the tandem deoxygenation–rearrangement–trapping reaction (Figure 2). Acrylate esters proved effective electrophiles: methyl acrylate and tert-butyl acrylate

• account for the modest isolated yields of the trapped azacycles (Scheme 5). Further electrophile trapping experiments were undertaken with dimethyl xanthate 23: methyl acrylate and phenyl vinyl sulfone gave the corresponding indenes 30 and 31, which could both be isolated, albeit in modest yields. Having

• sodium periodate as the stoichiometric oxidant and esterification using CH2N2 gave diester 35 (49%, 37% using Me3SiCHN2). Attempts to improve the procedure further by the use of alternative solvents proved unsatisfactory. Azacycle (+)-10, the product of deoxygenation-rearrangement-trapping with methyl

N-1 regioselective Michael- type addition of 5-substituted uracils to (2-hydroxyethyl) acrylate

• Sławomir Boncel,
• Dominika Osyda and
• Krzysztof Z. Walczak

Beilstein J. Org. Chem. 2007, 3, No. 40, doi:10.1186/1860-5397-3-40

• ] Mitsunobu reaction;[8] or reactions that operate through ANRORC-mechanisms that require the presence of strongly electron-withdrawing groups.[9] Recently, we have described an N1- and N3-regioselective Michael-type addition of 5-substituted uracil derivatives to methyl acrylate and acrylonitrile.[10

Asymmetric aza-Diels- Alder reaction of Danishefsky's diene with imines in a chiral reaction medium

• Bruce Pégot,
• Olivier Nguyen Van Buu,
• Didier Gori and
• Giang Vo-Thanh

Beilstein J. Org. Chem. 2006, 2, No. 18, doi:10.1186/1860-5397-2-18

• related Baylis-Hillman reaction between p-nitrobenzaldehyde and methyl acrylate using the above chiral IL.[25] A slight increase in de (not optimized value) was detected when employing p-methoxyphenyl (Table 3, entry 2, R = p-MeOC6H4). ILs are highly recyclable and do not lose any of their properties even