Ring-rearrangement metathesis of 3,6-dialkoxy-3,6-dihydro-2H-pyrans
نویسندگان
چکیده
منابع مشابه
Facile synthesis of novel D-ring modified steroidal dienamides via rearrangement of 2H-pyrans.
A simple and practical method for synthesis of the D-ring modified steroidal dienamides (4a-k) from the steroidal α,α-dicyanoalkene 3 and aldehydes via vinylogous aldol reaction was first reported. By using NaOAc as a base, the desired products were obtained in moderate to good yields in ethanol under mild conditions. All the synthesized steroidal dienamides are new and are currently being eval...
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Asymmetric allylic alkylation is a powerful reaction that allows the enantioselective formation of C-C bonds. Here we describe the asymmetric alkylation of alkylzirconium species to racemic 3,6-dihydro-2H-pyrans. Two systems were examined: 3-chloro-3,6-dihydro-2H-pyran using linear optimization (45-93% ee, up to 33% yield, 5 examples) and 3,6-dihydro-2H-pyran-3-yl diethyl phosphate with the ass...
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Ring-rearrangement metathesis (RRM) involves multiple metathesis processes such as ring-opening metathesis (ROM)/ring-closing metathesis (RCM) in a one-pot operation to generate complex targets. RRM delivers complex frameworks that are difficult to assemble by conventional methods. The noteworthy point about this type of protocol is multi-bond formation and it is an atom economic process. In th...
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A tricyclic lactam is reported in a four step synthesis sequence via Beckmann rearrangement and ring-rearrangement metathesis as key steps. Here, we used a simple starting material such as dicyclopentadiene.
متن کامل36 Algorithm
Algol 68 is considerably more difficult to learn than Pascal, partly due to the unusual terminology of Algol 68, which has not been widely accepted. The defining document of Algol 68 is much more elaborate and precise than the Pascal Report, but is also much more difficult to understand than the shorter and less formal Pascal document. This applies, in particular, to the two-level context-sensi...
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ژورنال
عنوان ژورنال: Tetrahedron Letters
سال: 2008
ISSN: 0040-4039
DOI: 10.1016/j.tetlet.2007.12.047