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4 results for “Stemona”
Synthetic Studies towards Pyrido[1,2-a]azepine Stemona Alkaloids
<p>The carbon skeleton of the <em>Stemona</em> alkaloids stemokerrin and cochinchistemonine was assembled from three building blocks (a piperidine, a furan, and a tetronate). Key steps linking the fragments included a Stille cross-coupling (piperidine/furan) and an aldol type addition of a tetronate. The furan served as a latent 1,4-difunctional compound which was converted to a gamma-hydroxylactone by a type II photooxygenation. Attempts to construct the C12-C13 double bond of stemokerrin by a late stage oxidation or by an elimination remained unsuccessful. The non-natural products dihydrostemokerrin and furostemokerrin were obtained instead.</p>
Synthetic Studies towards Pyrido[1,2-a]azepine Stemona Alkaloids
<p>The carbon skeleton of the <em>Stemona</em> alkaloids stemokerrin and cochinchistemonine was assembled from three building blocks (a piperidine, a furan, and a tetronate). Key steps linking the fragments included a Stille cross-coupling (piperidine/furan) and an aldol type addition of a tetronate. The furan served as a latent 1,4-difunctional compound which was converted to a gamma-hydroxylactone by a type II photooxygenation. Attempts to construct the C12-C13 double bond of stemokerrin by a late stage oxidation or by an elimination remained unsuccessful. The non-natural products dihydrostemokerrin and furostemokerrin were obtained instead.</p>
FIGURE 1 in Species delimitation of Stemona (Stemonaceae) based on sequences of five plastid DNA regions
FIGURE 1. Sampling sites of the 23 Stemona populations from China and two populations from Indonesia.
FIGURE 2 in Species delimitation of Stemona (Stemonaceae) based on sequences of five plastid DNA regions
FIGURE 2. Bayesian tree produced by analysis of five non-coding plastid DNA regions. Clade support is for maximum parsimony bootstrap percentages, maximum likelihood bootstrap percentages and Bayesian posterior probabilities in this order. Different topologies between the BI, MP, and ML trees are marked by asterisks.
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Allen Brain Atlas
Allen Brain Atlas is an Allen Institute collection of brain map atlases, datasets, APIs, and analysis tools covering mouse, human, and non-human primate brain resources.
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DANDI Archive for NWB datasets
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International Brain Laboratory public data
The International Brain Laboratory public data releases expose standardized mouse decision-making experiments, including Neuropixels recordings, widefield calcium imaging, behavior, and session metadata accessed through the ONE API.
OpenNeuro
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.